My name is Dr Margriet Dogterom and am the founder and owner of Beediverse. I write this blog for all who love bees and who want to learn more about these wonderful creatures.
Frank M. contacted me recently about his findings at his yearly mason bee workshop. A most interesting series of photos- with permission.
There have been half a dozen reports of cotton fluff inside the nesting tunnels. Here is one I found myself. Most of the fluff is just that, but two cocoon type structures were found in the center row. If someone knows what this is please let us know.
|A nesting tray with 6 routered channels containing mason bee cocoons,
and cotton type fluff in two of the channels.
|Here I have lifted some of the fluff out to show how it neatly fits into the channel.|
|Two cocoons were found inside this fluffy material.
You can see the end cap directly above where the cocoon is held in the photo.
The end cap is made of several layers of mud and is thicker than the usual mason bee end cap.
|For comparison, this appears like a spider web,
which either contains young spiders or an adult spider.
When I find resin bees inside nesting tunnels, I remove any mason bee cocoons , remove mason bee debris out of tunnels with a tooth brush, close up the nest and set out side ready for next year.
|Two delicately placed resin walls. No bees were in these cells.|
|Resin bee pupae within compartments made of resin.|
|Last year’s resin bees emerged during summer months
when resin softened up with the heat.
Last week a mason bee keeper asked me to look at these two photos and give them feedback on the insects inside the nesting tunnels. Every nesting tunnel tells a story!
|These are beneficial wasp pupae encased in a very delicate cover. They provision their nests with either spiders,
aphids or moth larvae. Sometimes if an egg does not
develop the larvae food remains in the cell.
|This is a picture of cocoons harvested from nesting tunnels.
The dark brown, still with mud attached, is from the early
spring mason bee Osmia lignaria. The reddish cocoon with its bright
orange fecal material and masticated leaf plugs are probably
Osmia californica. Osmia californica is active towards the end of the
early spring mason bee activity.
|These cocoons were harvested early October just when weather was getting colder
and water was condensing on the Quicklock nesting trays.
Early enough to avoid fungal growth over cocoons.
|These cocoons were harvested in early Nov, after cold weather had settled in.
A few cocoons were covered in mold. This mold is easily washed off in cold water and a little bleach.
|Quicklock nesting trays with 4 healthy looking cocoons.
Cocoons are covered in feces which is easily washed off in cold water.
|Quicklock trays with healthy cocoons. The brown and black speckles
are bee feces or frass.
Frass is easily washed off in cold water.
|These are different coloured mason bee mud plugs in Quicklock nesting trays.
The black paint is used to help bees orient to their nesting tunnel.
|Small cocoons towards the front of the tunnel are usually males.
The females are in the back of the nesting tunnel and are larger than the male cocoon.
|Sometimes a nesting tunnel consists of a few mud debris.
The female either died before she could finish the nest or she became
disoriented and found another nesting tunnel for nesting.
|Tunnels can be completely full or partly filled.|